0514 Valuation of skin friction coefficient for turbulence boundary layer on wave rough surface

Abstract

Most of resistance of a transport equipment, such as shipping, is caused by the fluid frictional resistance. Decreasing the fluid frictional resistance may improve the fuel consumption of a transport equipment. The fluid frictional resistance increases if the surface has the roughness. In this research, we measure the velocity profiles in zero-pressure-gradient boundary layer over the two dimensional wave rough surface, and calculate the friction coefficient by using the integrated boundary layer equation. We compare the frictional resistance on rough surface with that on smooth surface. We will discuss how the roughness affects a frictional resistance and a velocity profile.